53 



The general plane of tlu! uceipul is intermediate in ils degree of inelinatidii 

 to that of the tapir and our large caruivores,, and is indeed nearly vertical. 

 The occipital condyles project posterior to the general surface, and thus form 

 tlie most pi-ominent portion of the occiput, whereas in the tapir, bear, and cats 

 the summit of the occiput is most prominent backward. 



The articular surfaces of the condyles extend forward on the basi-oceipital, 

 and approach quite near each other, as in the bear. 



A large vencnis foramen occupies the course of the occipi to-temporal suture, 

 about the center of the lateral plane of tlie occiput. 



The auditory archway is high and narrow compared with that of the tapir. 

 It is widest above and has its sides converging inwardly. 



The post-glenoid tubercle, compared with that in the tapir and ijcar, is very 

 thick and strong. It is broad and mammillary, and is directed obliquely out- 

 ward and projects downward below the post-tympanic process. The base of 

 the cranium is very broad compared with that of the tapir, and in this resi)cct 

 is more like that of the great carnivores. 



The basi-occipital is broad and thick. It narrows forward from the posi- 

 tion of the paramastoid processes. Its sides are concave from before back- 

 ward, slope strongly from the upper edge toward each other, and are sepa- 

 rated by a median carina which expands behind and ends in front in a prom- 

 inence. The basi-sphcnoid, completely co-ossified with the basi-occipital, 

 appears as a narrowed extension of this, and is transversely convex. 



Large vacant spaces, occupied with the matrix of the fossil, are situated 

 below the position of the petrosals. The tympanies are lost. 



The glenoid articular surface is broad and nearly horizontal above, and 

 extends obliquely downward, outward, and backward on the robust post- 

 glenoid tubercle. 



The anterior condyloid foramen is situated about three-fourths of an intdi 

 in advance of the occipital condyle. 



The root of the pterygoid process is pierced with an ali-sphenoid canal, and 

 the oval foramen occupies a position just above it. 



Measurements of the cranium are as follows: 



Length of crauium from tbe C0Qca,vity at the summit of the occiput to a 

 line between the post-orbital processes, following- the curvature of the 

 forehead 9 inches. 



Breadth acress the face, following the convexity between the ends of the 



post-orbital processes S^ inches, 



Distance between the orbits across the face above inches. 



